feat: Implement Phase 1 Shopify-inspired settings (Store, Payments, Shipping)

✨ Features:
- Store Details page with live currency preview
- Payments page with visual provider cards and test mode
- Shipping & Delivery page with zone cards and local pickup
- Shared components: SettingsLayout, SettingsCard, SettingsSection, ToggleField

🎨 UI/UX:
- Card-based layouts (not boring forms)
- Generous whitespace and visual hierarchy
- Toast notifications using sonner (reused from Orders)
- Sticky save button at top
- Mobile-responsive design

🔧 Technical:
- Installed ESLint with TypeScript support
- Fixed all lint errors (0 errors)
- Phase 1 files have zero warnings
- Used existing toast from sonner (not reinvented)
- Updated routes in App.tsx

📝 Files Created:
- Store.tsx (currency preview, address, timezone)
- Payments.tsx (provider cards, manual methods)
- Shipping.tsx (zone cards, rates, local pickup)
- SettingsLayout.tsx, SettingsCard.tsx, SettingsSection.tsx, ToggleField.tsx

Phase 1 complete: 18-24 hours estimated work

admin-spa/src/hooks/useShortcuts.tsx

@@ -19,14 +19,14 @@ export function useShortcuts({ toggleFullscreen }: { toggleFullscreen?: () => vo
       // Always handle Command Palette toggle first so it works everywhere
       if (mod && key === "k") {
         e.preventDefault();
-        try { useCommandStore.getState().toggle(); } catch {}
+        try { useCommandStore.getState().toggle(); } catch { /* ignore if store not available */ }
         return;
       }
 
       // If Command Palette is open, ignore the rest
       try {
         if (useCommandStore.getState().open) return;
-      } catch {}
+      } catch { /* ignore if store not available */ }
 
       // Do not trigger single-key shortcuts while typing
       const ae = (document.activeElement as HTMLElement | null);